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From The Saab Tech Wiki
** 3 - 400 mm
** 4 - 800 mm
[[File:vh_1a.jpg|thumb|none|Fig. 1 - Vacuum hose lengths]][[File:tb_1c.jpg|thumb|none|Fig. 2 - Throttle body labels]]
*PCV Components - Fig. 3
** d - Generic 4-mm rubber hose, NAPA H-459
** e - PCV check valve #7521313
[[File:pcv_7.jpg|thumb|none|Fig. 3 - PCV Components]]
The check valve (PCV valve) needs periodic replacement. The plastic valve cover nipple, grommet (bushing) and larger diameter hose may also need replacement if leaking oil.
[[File:vac_2.jpg|thumb|none|Fig. 4 - PCV Valve Hoses]]
=== MAP Sensor===
Not the same part number and material as the other hoses (possibly silicone rubber from the factory). It seems more durable, and should probably only be replaced by a compatible silicone hose. It leads to the manifold air pressure (MAP) sensor.
[[File:vac_3.jpg|thumb|none|Fig. 5 - MAP Sensor hoses]]
=== Fuel Pressure Regulator===
From the throttle body to the fuel pressure regulator (FPR). The FPR is on the driver side of the fuel rail, below the charge air pipe and behind a connector bracket. The view on the left is from the driver side fender, and after unplugging the three connectors. This line can be hard to inspect and replace because most of it is hidden under fuel rail wiring.
[[File:vac_4.jpg|thumb|none|Fig. 6 - Fuel Pressure Regulator hoses]]
=== Charge Air Bypass Valve===
Runs along the "charge air pipe" to the turbo bypass valve (BPV) at the front of the engine compartment. This is the longest of the four hoses.
[[File:vac_5.jpg|thumb|none|Fig. 7 - Charge Air Bypass hose]]
=== Evap System Purge Valve===
The purge valve hose for the Evaporative Emission System connected to the throttle body is not an actual vacuum line (different size and material). It allows fumes to be sucked from the charcoal canister in the wheel well into the intake and burned. However, if the hose is broken, or the purge valve faults, the effect can be the same as a vacuum leak.
[[File:prg_6.jpg|thumb|none|Fig. 8 - Evap System Purge Valve]]
